Product Description
The CUMMINS 4988747 OEM MECHANICAL FUEL TRANSFER LIFT PUMP is the genuine camshaft-driven piston pump that keeps your 1994–1998 5.9L 12-valve Cummins and its Bosch P7100 injection pump properly fed. This OE pump delivers the correct low-pressure fuel supply, supports easy starts with a built-in hand primer, and maintains stable pressure for towing, performance tuning, and daily driving.
Unlike off-brand copies, this genuine Cummins 4988747 fuel transfer pump is built to OE specifications for long life and consistent output. If your truck is hard to start, feels lazy under load, or shows low supply pressure, a fresh OEM lift pump is the first step in getting your fuel system back to factory performance.
Fitment
- Engine: 5.9L 12V Cummins (6BT) with Bosch P7100 injection pump
- Truck: 1994–1998 Dodge Ram 2500/3500
- Configuration: Camshaft-driven, block-mounted mechanical lift/transfer pump
- Industrial/Other: Various B/ISB Tier 2 and 6CTA/ISC applications – always verify by ESN before ordering.
Does NOT fit: 1989–1993 VE-pump trucks, 1998.5–2002 24-valve VP44 trucks, or 2003+ common-rail applications. Those platforms use different lift pump systems.
Cross-Reference & Related Cummins Parts (CPP Diesel)
- For 1989–1993 VE-pump trucks, see CUMMINS 4983584 OEM MECHANICAL FUEL TRANSFER (LIFT) PUMP – 5.9L CUMMINS (1989–1993) .
- When deleting the factory fuel pre-heater and correctly spacing this pump, use CUMMINS 3914284 OEM LIFT PUMP SPACER PLATE – 12-VALVE 5.9L (1994–1998) .
- For the hard line from lift pump outlet to filter inlet, pair with CUMMINS 3918880 OEM FUEL SUPPLY TUBE (LIFT PUMP TO FILTER) – RAM 5.9L 12V (1994–1998) .
- For the filter-to-P7100 supply tube, use CUMMINS 3936691 OEM P7100 FUEL SUPPLY LINE / TUBE – 5.9L 12V (1994–1998) .
Why Choose Genuine Cummins 4988747 from CPP Diesel?
- Correct OE cam-profile and piston design for healthy P7100 inlet pressure.
- Integrated hand primer for fast priming after filter or line service.
- Direct bolt-on fit to the factory block pad with the proper spacer and gasket.
- Supports stock and mild performance builds without starving the injection pump.
- Backed by CPP Diesel’s Cummins-specific fuel system expertise.
Specifications for cummins 4988747
| Brand | Cummins Genuine Parts |
| Part Number | 4988747 |
| Product Type | Mechanical fuel transfer (lift) pump, camshaft-driven piston style |
| UPC | 0713095921616 |
| GTIN | 0713095921616 |
| Shipping Info | Ships from CPP Diesel; small-parcel ground service; free standard shipping within the continental USA. |
| Approx. Shipping Weight | ~5 lb (pump and packaging) |
| Package Dimensions (CPP) | Approx. 19" W × 13" H × 19" D (shipping box) |
| Cross Reference (Part Numbers) | 3936316, 3936317, 4944710, 4761979, 4988751, Bosch 0 440 020 047 (applications vary – always verify by ESN) |
| E-Codes | Not applicable – mechanical fuel system service component (no separate emissions E-code). |
| Typical Outlet Pressure | ~25–35 PSI at idle (system-dependent, measured at P7100 inlet) |
| Application Range | 1994–1998 Dodge Ram 2500/3500 with 5.9L 12V Cummins & Bosch P7100; select B/ISB/6CTA/ISC industrial & off-highway. |
| Prop 65 | WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, visit www.P65Warnings.ca.gov. |
FAQ
Will this pump fit my 1994–1998 12-valve Cummins Ram?Yes. Cummins 4988747 is the correct OEM mechanical fuel transfer (lift) pump for 1994–1998 Dodge Ram 2500 and 3500 trucks with the 5.9L 12-valve Cummins using the Bosch P7100 injection pump. Always confirm by VIN or engine serial number if you are unsure.
Does this include the hand primer on top of the pump?
Yes. This is the genuine piston-style pump with the integrated hand primer on the top, so you can quickly prime the fuel system after filter changes or fuel system service.
Do I need a spacer and gasket when installing this lift pump?
For 1994–1998 12-valve trucks, you should use the proper spacer plate and mounting gasket at the block pad. CPP Diesel recommends pairing this pump with the CUMMINS 3914284 spacer plate and a quality 3939258-style gasket to ensure correct pump stroke and leak-free sealing.
What fuel pressure should I see with this pump?
On a healthy system, you’ll typically see around 25–35 PSI at idle at the inlet of the P7100 injection pump. Always verify with a quality gauge and check filters, lines, and fittings if pressure is lower than expected.
Will this work on 1998.5–2002 24V or 2003+ common-rail trucks?
No. 1998.5–2002 24V VP44 trucks and 2003+ common-rail Cummins engines use different (mostly electric) lift pump systems and plumbing. This 4988747 mechanical pump is for 1994–1998 12-valve P7100 applications only.
Is this a genuine Cummins part or an aftermarket copy?
This is a genuine Cummins 4988747 pump sourced through CPP Diesel – not a generic aftermarket casting. You get proper fitment, OE-level durability, and the correct output for your P7100 fuel system.
